Another package broken by removal of gobjectIntrospection from propagatedBuildInputs of atk (6bbec17).

This is similar to ea595a0, 5350b0f, 2a1425d, d99321c, etc.

Motivation for this change

Without this, virt-manager fails to start with this error:

Traceback (most recent call last):
  File "/nix/store/5fvw5w6bykry9yqnz0wfrn39s7x3fhcx-virt-manager-1.4.3/share/virt-manager/virt-manager", line 32, in <module>
    gi.require_version('LibvirtGLib', '1.0')
  File "/nix/store/p6fnhmmvr28ziv19c37hr9n6vkcy25an-python2.7-pygobject-3.26.1/lib/python2.7/site-packages/gi/__init__.py", line 130, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace LibvirtGLib not available

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.